Soldier and I talk to the detective (7,3)
I believe the answer is:
private eye
'the detective' is the definition.
(private eye is a type of detective)
'soldier and i talk' is the wordplay.
'soldier' becomes 'private' (private is a type of soldier).
'and' is a charade indicator (letters next to each other).
'talk' shows a homophone (sound like).
'i' sounds like 'eye'.
'private'+'eye'='PRIVATE EYE'
'to' acts as a link.
(Other definitions for private eye that I've seen before include "investigator" , "Investigative satirical magazine" , "Periodical" , "Spade, say" , "50 today" .)